Sash-balancing mechanism.



I. LASERSOHN.

SASH BALANCING MECHANISM. APPLICATION FILED $221.5, 1911.

Patented Oct 31,1911.

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1. LASERSOHN. S'ASH BALANCING, MEGHANISM.

APPLICATION FILED SEPT. 5, 1911.

Patented Oct. 31, 1911.

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Mvwasszs ISAAC LASERSOHN, OF ST. LOUIS, MISSOURI.

SASI-I-BALANGING- MECHANISM.

Specification of Letters Patent.

Patented Oct. 31, 1911.

Application filed September 5, 1911. Serial No. 647,752.

To all whom it may concern Be it known that I, ISAAC LASERSOHN, a citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in Sash-Balancing Mechanism, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to an improved sashbalancing mechanism, and consists in the novel construction and combination of parts hereinafter described and claimed.

The object of my invention is to provide an improved sash-balancing mechanism, which will be applicable to one or both sides of the window frame, and which can be applied to windows and sash already in use at reasonable expense.

A further object is to provide an improved sash-balancing mechanism which shall be devoid of sash cords and chains.

In the drawings: Figure 1 is a sectional front elevation of a window frame and sash having my invention applied thereto, one side of the window being broken away, to reduce the size of the drawing. Fig. 2 is an enlarged sectional plan view, showing the details of the sash-weight and adjacent parts, the section being taken on the line 22 of Fig. 1; Fig. 3 is an enlarged detail sectional elevation of a portion of the screws used in elevating and lowering the sash; Fig. 4 is an enlarged sectional plan view, showing the details of the sash-bracket, the section being taken on the line 4-4 of Fig. 1; Fig. 5 is a side elevation of a window frame, having my invention applied to both the lower and upper sash of said frame; Fig. 6 is a sectional detail view of the upper end of one of the sash screws and its bearing bracket; Fig. 7 is a sectional side elevation of a portion of a window frame and its sash fitted with an anti-friction roller, as made use of by me in some instances of narrow windows which require sash balancing mechanism at one side only.

The numeral 1 indicates the usual j ambs, 2 the lower sash, 3 the upper sash, and 4 the sash-stops.

Mounted upon the exterior of the window jamb 1, and extending parallel therewith, is a vertical screw-rod having a screw 5 of coarse pitch on its lower portion, and another screw 6 of rather finer pitch upon its upper portion, and said screw-rod is mounted to revolve in suitable bearing brackets 7 and S, the bracket 7 forming a bearing for the upper end of said screw-rod and the bracket 8 forming a bearing for the lower end thereof, said brackets being fastened to the window frame by means of common screws. The opposite ends of said screw-rod are provided with common journals, as shown in Fig. 6, said screw-rod is also preferably provided with an intermediate bearing 9, which is in the form of a bracket projecting at right angles from the lower end of the sash-weight guide-bar 10. Said sash-weight guide-bar 10 extends parallel with the screws 6 from said intermediate bearing 9 to the bracket at the outer end of said screw 6. The screw-rod is preferably formed in two separate pieces, one piece for the coarse screw 5 and the other piece for the finer screw 6, but if desired said screw-rod may be made of a single piece of metal. In case the said screw-rod is made in two pieces, as shown, I form the same by spirally twisting, almost its whole length, a suitable rod which is cruciform in cross section (see Figs. 2 and 4) and thereby forming a screw 5 of rather coarse pitch, the upper end of which is united to the screw 6 by means of a suitable coupling 11. The finer screw 6 is made in the same way, by twisting a metal rod that is cruciform in cross section.

The coupling 11, which unites the screws 5 and 6, is provided with an annular flange 12, which receives the downward thrust of the screw-rod in operation, and relieves the lower bracket 8 of considerable strain. It

I will be observed that the annular flange 12 rests in contact with the upper surface of the intermediate bearing 9. (See Fig. 3.)

13 indicates the sash-weight, which is raised and lowered whenever the screws 5 and 6 are revolved in their bearings. The means for revolving said screws are preferably described as follows: At the bottom rail of the sash is a bracket 14; secured to said sash by means of suitable screws, and said bracket has a vertical arm projecting upwardly at a right angle. (See Fig. 1.) The window jamb 1 has a vertical slot 15 through which projects a thin arm or shank 16 of the traveling nut 17, and this nut is threaded internally to fit the threads of the screw 5, so that whenever said nut is moved up and down in raising and lowering the sash 2, the said screw 5 will be revolved. To relieve the slot from the frictional contact of the shank 16 T mount a roller 18 in an opening 19 formed in said shank. Said roller 18 is mounted to revolve on a pin or ournal 20, which is fixed in the said shank 16, so that the periphery of said roller will engage the sides of a groove 21 formed in the jamb, and thereby relieve the said shank of the friction caused by the torsional strain on the said shank, and also to prevent undue friction between the sash and sash-stops.

The saslrweight guide-bar 10 is T-headed, as shown, and the sash-weight nut 22 is provided with flanges 2;?) which engage beneath the head of the said. guide-bar 10, so that said sash-weight nut may travel up and down upon the said guide-bar and be guided vertically in its movements. The said sash weight nut is provided on opposite sides with lugs 2% from which the sash-weight 13 is suspended. It will be understood that the sash-weight 13 may be of any desired weight and length. indicates a notch formed in the sash-weight to permit it to be hooked upon and suspended from the said lugs 24.. The said nut 22 is threaded internally to fit the threads of the screw 6. (See Fig. 2.)

T have thus far described the sash-balancing mechanism applied to the lower sash 2. in applying the balancing mechanism to the upper sash 3, the position of the screw (5 and weight 13 are reversed. that is the said screw (3 and weight 13 are placed at the lower end at the window jalnh, as shown in Fig. 5, but otherwise the construction is the same as heretofore described.

in narrow windows it will only be necessary to apply my sash-balancing mechanism to one side of the sash, but in so doing l. provide the opposite side of the sash with an antitriotion roller 26 to roll upon the janib 1. and thereby prevent undue frictional contact, as shown in Fig. 7.

The operation is as follows: Upon raising or lowering either of the sash, its corresponding screws!) and 6 will be rotated and its sash-weight 13 will be moved accordingly in an opposite direction, the said screws having opposite pitches, permitting the sash to move in one direction while its weight moves in an opposite direction.

lVhat I claim is:

1. The improved sash-balancing mechanism, comprising a combination with a window frame having the vertical slot- 15 in its jamb, the sash, the bracket 14 connected to the sash and having a shank projecting through said slot in said jamb, a nut at the outer end of said shank, a coarse pitch screw threaded into said nut and mounted to revolve in fixed bearings, another screw o't finer thread, and having a reverse pitch and connected to revolve with said first mentioned screw whenever said nut is moved up and down upon the latter, and a sash-weight arranged to be moved up and down by the said screw which has the reverse threads.

2. The improved sash-balancing mechanism, comprising a combination with a window frame having the vertical. slot 15 in its jamb, the sash, the bracket 14 connected to the sash and having a shank projecting through said slot in said jamb, said shank having an opening, an anti-friction roller mounted in said shank, a nut at the outer end of said shank, a coarse pitch screw threaded into said nut and mounted to revolve in fixed bearings, another screw of finer thread, and having a reverse pitch and connected to revolve with said first mentioned screw, whenever said nut is moved up and down upon the latter, and a sash-weight arranged to be moved up and down by the said screw which has the reverse threads.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

ISAAC LASERSOHN.

l Vitnesses E. L. ALLAon, J. R. FRAME.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

